lindsey



W. D. LINDSEY S IGNAL SYSTEM Filed Nov. 17, 1933 3 Sheets-Sheet l RY m MW VJ WM M M A 7 TOR/V5 Y Dec. 28, 1937.

w. D. LINDSEY SIGNAL SYSTEM Filed Nov. 17 1953 a Sheet-Sheet 2 INVENTOR I'V/LL/AM D. Lnvossr A TTORINE r nec zs, 1937. w, D, LINDSEY 2,103,857

- SIGNAL SYSTEM Filed Nov. 17, 1933 3 Sheets-Sheet 3 l l l'l l l' [N VENTOR 95 M lLL/A/V 0, LINDSEY ATTORNEY Patented Dec. 28, 1937 ouirso srA'rss mass? PATENT osrics Application November 17, 1933, Serial No. 698,389

13 Claims.

The invention herein disclosed relates to a signal system and in particular to a system in which spoken instructions are given to direct a course of procedure upon the happening of a particular event.

In the event of the existence of a dangerous condition, which might endanger human lives, such, for example, as a fire in an occupied building, an alarm is commonly sounded by the one discovering the condition, or in the case of automatic detection, by the mechanism. The alarm is usually designed to alarm the occupants of the building to the existing danger. Such alarms do in fact alarm people and areconducivc to the production of that unreasoning fear which causes a panic and a catastrophe. Frequently, this condition is brought about where there is no imminent danger and could often be avoided by the voice of a person having presence of mind and directing a course of action for the evacuation of the building, and it is the object of this invention to provide a signal system which will not alarm occupants of a building in which a dangerous condition exists but which will provide directions for an orderly evacuation of the building.

By the invention herein disclosed, a signal system is provided in which a sound reproducing system is used to notify the occupants of the building of a dangerous condition and to direct their exit from the building. In accordance with the invention, loudspeakers are mounted in strategic locations throughout the building such that every occupant of the building will be within hearing distance of a loudspeaker. A sound record is interconnected with the system and upon operation of the system directs, through the loudspeakers, the evacuation of the building. In the case of a signal system to be used in the event or" a fire, the operation of which is effected either manually or automatically, the sound reproducing system is set into operation upon the automatic or manual initiation of the operation of the system.

In one system which embodies the invention and which is particularly suitable for use in the event of a fire in a school building, includes a plurality of loudspeakers distributed throughout t? building, one in each classroom and such 0 2' rooms as are occupied by the students. in this system there is provided a control panel on which all of the control units of the system are mounted, an amplifier unit, a sound record and an electrical pick-up. The system may be set into operation either manually or automatically through a thermo-responsive device. In

either event, the electrical pick-up is connected to the amplifier andthe amplifier is connected to the several loudspeakers throughout the building. The electrical pick-up translates the sound record into electrical impulses which are amplilied and distributed to the loudspeakers where they are translated into sound. When the system is set into operation, in accordance with one sound record, a blare of trumpets is heard from the loudspeakers which attracts the attention of the occupants of the building. This is followed by a siren obligato which rivets the attention of the occupants of the building upon the loudspeakers and then an announcement follows, approximately as follows:

This is a fire emergency but there is no danger! You-every onemust leave the building promptly. Close all windows and doors. Leave your hats, coats and books. Take your place in line. You have been drilled; you know just what to do! March out when I give the command Go! Dont push! There is no danger! Follow the green arrows to safety! All setmark time-Left! Left! Left! Left! Go! Upon the statement Mark time a march is played to which the students march out of the building. Interpcsed with the music at short intervals, such statements as Keep in line, Follow the green arrows, There is no danger, Follow the green arrows to safety are emitted to soothe the exciting students and prevent any condition which would cause a panic.

A feature of this system is the fact that it may be used as a public address system. For this purpose there is provided an announcement panel which contains a microphone that may be manually connected into the system. The interconnection of themicrophone into the system is, however, made dependent upon the continued in action of the controls which are set in operation in the event of an actual fire. When the controls set in operation by an actual fire are actuated, the interconnection of the microphone is rendered inoperative for a period of ninety seconds in which the directions for the evacuation of the building are given by the automatic sound reproducing system. Thereafter the superintendent or any other person in charge can cut in on the microphone and direct the further course, that is, a return of the students to their classrooms, or any other course of procedure.

Another feature of the system is the fact that all of the elements thereof are under continuous electrical supervision. This supervision includes,

c. into a supervisory circuit.

as well as the various microphones, record operating motors and controls and circuit interconnections, the filaments of the thermionically active tubes of the amplifiers.

Another feature of the system is the fact that the filaments of the thermionically active tubes of the amplifiers are preheated so that it takes but a matter of a few seconds to bring the filaments to operating temperatures when the operation of the system is efl'ected.

This sound signal system may be interconnected with local and remote signals for visually directing the evacuation of the building and for calling the fire department. 4

Such a system is disclosed in the accompanying drawings and described in detail below from which illustration and description a clearer understanding of the invention may be had.

In the drawings:

Fig. 1 illustrates the control panel of the system;

Fig. 2 illustrates the amplifier unit;

Fig. 3 illustrates the announcing panel; and

Fig. 4 is a diagram of the interconnection of this sound signal system with other signal systems.

The system illustrated in the drawings includes a sound record of the phonograph type which is mounted upon a rotatably mounted table that is driven by a motor I, an electrical pick-up 2 which cooperates with the sound record, an amplifier 3 for amplifying the electrical impulses and a series of loudspeakers 4a, 4b and 4c. The table motor I is a 110 volt motor and it is supplied with current by a generator 5 which is driven by a motor 5', the generator producing an alternating current of cycles at 110 volts. The motor generator set is provided in order to render the system independent of any particular external electrical supply. The motor 5' is a thirty-two volt motor and is driven from a battery 6 which is connected to a control panel I by line wires AI and A2 and battery connectors 6a and 6b on the panel. Normally, the electrical pick-up 2 is connected This supervisory circuit includes positive line wire AI, a supervisory relay 8, a conductor BI, a stationary contact 9a of a relay 8, a cooperating movable contact 91) normally in contact with the contact 911, a conductor B2 connecting the contact 917 and one side of the electrical pick-up through a connector 2a on the panel, a conductor B3 connecting the other side of the pick-up through a connector 2b to a movable contact 90 of the relay 9, a stationary contact 9d of the relay 9 and normally engaging the contact 90 and a conductor A3 connecting the connector 9d to the negative line wire A2. The supervisory relay 8 into which the pick-up 2 is normally connected controls two trouble'circuits, one which effects the operation of a local or immediate visual trouble signal or light I 6 indicating when lighted the specific circuit on which the trouble exists and the other a remote trouble circuit. The immediate trouble circuit includes a conductor A4, which connects the positive line' tact II a and a conductor C5 which connects the movable contactor III) to the negative line wire A3. 7

Upon the simultaneous operation of relay 9 and a relay I2, the pick-up 2 is connected to the input side of the amplifier 3. When the relay 9 operates the conductors B2 and B3 connecting the pick-up with the movable contacts 91) and 90 of the relay 9 are connected to conductors B4 and B5 through stationary contacts 9e and 9 respectively of relay 9 which are engaged by the movable contacts 9b and 90 upon energization of relay 9. The conductors B4 and B5 are also respectively connected to stationary contacts I 2e and I2f of relay I2 which upon energization of the relay I2 are engaged by movable contactors I21) and I20 actuated by relay I 2. The contactors I21) and I2c are connected respectively to conductors B6 and B! which are also connected to connectors I3a and I3b on the panel 1. The connectors I 3a and I3?) are connected through conductors B8 and B9 to connectors I3a and I3b on the amplifier which are the input connectors of the amplifier.

The output of the amplifier is connected through a relay I4 to the loudspeakers. The output connectors I5'a and I5'b of the amplifier are connected by conductors BIO and EH to connectors I5rz. and I517 on the panel 1.. These latter connectors are connected by conductors BIZ and BIS respectively to stationary contacts Ida and Nb on the relay I4. The relay I4 is normally deenergized but upon energization, the contacts Ida and MD are engaged by movable contacts I40 and Md respectively The movable contacts I40 and Md are connected by conductors EM and BI5 to connectors Ifia and Ifib to which the three loudspeakers ia; 4b and 4c are connected in series.

The simultaneous operation of relays 9, I2, II and I4 for the purpose of connecting the pick-up through the amplifier to the loudspeakers is efiected upon the operation of a relay H. The relay I! may be controlled directly by a fire circuit or indirectly through a fire relay. In conjunction With'Fig. 1' of the drawings there is illustrated a fire circuit for the purpose or" operating the relay IT. This circuit includes a' ther'rno-responsive cable I8 of the type illustrated and described in the copending application of William D. Lindsey,

Serial No. 352,624, filed April 5, 1929, for Cable and method of producing the same, and a supervisory relay I9which acts as a supervisory relay for this fire circuit. The fire circuit includes a conductor A5 which is connected to the positive line wire AI and to which one side of the relay IT is connected by a conductor DI, a conductor D2 connecting the other side of the relay I? and one side of the relay I9, a conductor D3 connecting the relay I9 and a connector ISa on the panel I, a conductor D4 connecting the connector I9a and one side of an element D5 of the thermoresponsive cable I8, a resistance 25 connecting the other end of the element D5 with the corresponding end of another element D5 of the thermo-responsive. cable I8 and a conductor D7 connecting the other end of the element D5 with the negative terminal 6b of the battery. Upon the existence of abnormal thermal conditions, the elements D5 and D6 which. are normally insulated become electrically connected. Upon the happening of such an event the resistance 20 is cut out of the circuit D. The resistance 29 is such as to prevent a flow of current through the circuit which is sufficient tooperate'the relay I'I' but to permit a current which is sufiicient to maintain positive line wire A5.

the relay l9 energized. Upon the resistance being cut out of the circuit, however, the current flowing through the circuit is increased sufficient- 1y to energize relay ll. The same effect, that is, the shunting of the resistance 26 of the fire circuit, may be accomplished manually through a manual fire box illustrated diagrammatically at 2 I. This manual fire box is merely a switch which is connected across the terminals of the resistance 2E2. Upon closing the switch, the resistance 28 is shunted out of the circuit D.

Relay l i has three pair of cooperating fixed and movable contacts Ila-41b l'lc-lld and lle-i'lf. The cooperating movable and fixed contacts lid and lie are normally open but become engaged upon the energization of the relay. These two contacts are connected into and con trol a circuit including the relays H and M connected in series. This circuit includes a conductor El connecting the conductor A3 and the movable contact l'ld, fixed contact We, a conductor E2 connecting fixed contact lie and relay H, a conductor E3 connecting relay ll and relay l4 and a conductor E4 connecting relay l4 and Thus, upon the energization of relay l'l, relaysl l4 and H are energized.

Upon being energized, relay ll actuates the movable contact lib thereof and it is separated from the contact Hot and engages a stationary contact llc. Engagement of the contacts I lb and effecting the energization of these several relays includes negative line wire A3, conductor 05,

movable contact lib of relay ll, fixed contact llc, conductor F! connecting contact He and one side of relay 22, relay 22, a conductor F2 connecting relay 22 and relay 23, relay 23, a conductor F3 connecting relay 23 and relay 24, relay 24, a conductor F 5 connecting relay 24 and relay 25, relay 25, a conductor F5 connecting relays 25 and 26, relay 26, a conductor F5 connecting relay 26 and relay 9, relay 9, a conductor Fl connecting relays 9 and i2, relay it, a conductor F8 connecting the relay l2 and a connector 21, conductor F9 connecting the connector 2'! and a movable contact 28a of a relay 28, a fixed contact 2817 of relay 2% which engages contact 2511 when relay 28 is energized, and a conductor Fill to which contact 28b is connected and which is also connected to the positive line wire Al. It will be apparent of course that the completion of the circuit including these several relays connected in series and consequently the simultaneous operation thereof is dependent upon the operation of the relay 28. This relay is, however, connected in series with a relay 29 and the two relays connected across the'battery upon the operation of the relay l I. circuit including the several relays and the battery is completed upon the operation of relay H.

The circuit for energizing the relay 28 upon the operation of the relay ll includes negative conductor A3, conductor C5 connecting the negative conductor A3 and the movable contact 2 lb of relay ll, fixed contact llc, conductor Fl, a con I ductor G! connecting conductor Fl and the movable contact 30) of a relay 3! The movable contact 30f normally engages a fixed contact w of the relay 3!] and the fixed contact 3dr; is connected by a conductor G2 to one side of the relay 29. The other side of the relay 29 is connected by a conductor Fl ii.

speakers to, 4b and to.

The relay 28 is therefore energized and the conductor G3 to one side of relay '28 and the other side of relay 28 is connected to the positive Thus the relays 28 and 29 are connected in series by the energization of the relay H and these two relays are operated simultaneously with the operation of relay l l.

Through the circuits and the operation of the relays as above described the electrical pick-up is connected through the amplifier to the loud- At the'same time, the operation of the relays 28 and 29 effects the operation of the turntable motor I which drives the table on which the phonograph record is mounted. This turntable and the cooperating electrical pick-up are well known commercial instru mentsand are no u therefore illustrated and described in detail. The phonograph, that is, the electrical pick-up and the record, are reset automatically when the electrical pick-up has completely traversed the record. Upon the energization of the relay 28, the motor 5 which drives the generator 5 is connected across the battery and the generator is connected to volt line wires which supply the motor i and the filaments of the thermionically active tubes of the amplifier. The relay 28 has movable contacts 28a, 28b and 28c. Cooperating with the movable contact 28a there is a fixed contact 28d which is normally separated from the contact 28a. Cooperating with the contact 28?) there are two fixed contacts 28c and 28). The contact 232) normally engages the contact 28c and is normally separated from, the contact 28f. The contact 28c also has two fixed contacts 28g and 2872 with which it cooperates. 28c engages the contact 2% and is separated from the contact 28g. Upon energization of the relay contact 28a engages contact 28d and the circuit to the motor is closed which circuit includes a conductor Hi which connects one side of the motor with the conductor Fl 0, a conductor H2 connecting the other side of the motor with the movable contact 28a and a negative conductor H3 which. is connected to the contact 28d and to the negative line wire A2 through a connector on the panel l. The motor 5 is thus connected across the battery and is operated. The contact 28b is connected through a relay 28 to one side of the generator 5 by conductors I1 and I2, the conductor 11 connecting the contact 282) and one side of the relay, and the conductor I2 connecting the other side of the relay and the generator. The other side of the generator is connected by a conductor 13 to the contact 280 and by a branch conductor ii to the stationary contact 28!. The contact 280 cooperating with the contact 28b and engaged thereby when the relay 28 is operated is connected by a conductor I4 to a 110 volt line wire J5. Thus when the relay 25 is operated, the relay 28' is connected across the generator and the conductor I1; is connected to the conductor I4 and thus to the 110 volt line wire J i. This connection is through the engagement of the movable and fixed contacts 287) and 28] and the movable and fixed contacts 28c and 289. The engagement of the contacts 281) and 28f place the r lay 28 across the generator and the engagement of the contacts 28c and 28g connect the conductors I3 and it. The relay 28 which is a potential relay has three movable contacts 28'11, 28'?) and 280. Upon energization contact 25in is brought into engagement with a stationary contact 28'd. Contact 28/12, is connected to the conductor I2 thus directly to one side of the generator. The contact Zild Normally the contact is connected by a conductor 15 to a 110 volt line wire J2. On engagement of the contacts 28's: and 28'd of the relay 28, therefore, the line wire J2 is directly connected to one side of the generator, the line wire J I being directly connected to the other side of the generator as heretofore explained. Contact 23'0 cooperates with a stationary contact 28'g and engages this stationary contact upon energization of the relay 28. The contact 28c is connected to the conductor II and its cooperating contact 23g is connected by a branch conductor 22 to the conductor I3. With 7 these interconnections it will be observed that the engagement of the contacts 280 and 28g connects the relay 28 across the generator inde pendently of the contacts 28b and 28f of the relay 28. In this way the motor generator set is operated and the generator is connected to the 110 volt line wires J I and J2. These line Wires are connected at one end respectively to fixed contacts 230 and 23d of relay 23. These two contacts are engaged by movable contacts 291) and 29d upon the energization of the relay 29. The movable contacts 2% and 29d are connected respectively through conductors KI and K2 to the table motor. Consequently upon the energization of relays 2S and 29 the generator and the table motor I are directly connected and the motor is operated. With the operation of the table motor I the recorded sound is transposed into electrical impulses by the electrical pick-up which impulses are delivered to the amplifiers wherein they are amplified and as amplified sent through to the loudspeakers of the system.

The amplifier is an ordinary commercial amplifier with the exception of. the character of the connection of the secondary of the transformer to the ground and the connection to the filaments of the tubes. Taps from the secondary of'the t transformer are connected to conductors K'I and K2. The conductors KI and K'2 are connected respectively to fixed contacts 28'e and 28f. of the relay 28. These two fixed contacts are engaged by the movable contact 28b when the relay 28 is energized. The movable contact L so that there is constant electrical supervision of these tubes. The current flowing through the circuit is insufiicient to raise the filaments to operating temperatures but it is suificient to effect a preheating of the tubes so that upon the operation of the system and the reconnecting of the tubes, it takes less time than normally for the tubes to reach operating temperatures. The normal supervisory circuit includingthe filaments of the tubes is as follows: conductor A which connects the positive line wire AI and a fixed contact 2260 of relay 22, movable contact 22b of relay 22 which normally engages contact 722a, a conductor LI connecting the movable contact 2212 and a connector 35 on the panel I, a conductor L2 .connecting the connector 3| and a connector 3| on the amplifier, a conductor L3 con-,

necting connector 3i and one side of a filament 32a of a thermionically active tube 32 in the amplifier, a conductor L4 connecting the other side of the filament 32a with a connector 33 on the amplifier, a conductor L5 connecting the connector 33 and a connector 33 on the panel I, a conductor L6 connecting the connector 33 and movable contact 22d of relay22, a fixed contact 22c of relay 22 normally engaging contact 2211, a conductor LI connecting fixed contact 220 of relay 22 and a fixed contact 23a of relay 23, a movable contact 231) of relay 23 which normally engages fixed contact 23a, a conductor L3 conmeeting the movable contact 2317 and a connector 34 on the panel I, a conductor L9 connecting contactor 34 and a connector 34' on the panel and the amplifier respectively, a conductor LIB connecting connector 34 and one side of a filament 35a of a thermionically active tube 35, a conductor LII connecting the other side of the filament 35a and a connector 33' on the amplifier,.

a conductor LI2 connecting the connector 36 on the amplifier with a connector 35 on the panel I, a conductor LI3 connecting the connector 36 and a movable contact 23c of relay 23, a stationary contact 23 of relay 23 which normally engages contact 23c, a conductor LI4 connecting the stationary contact 23f of relay 23 with a stationary contact 2411. of relay 24, a movable contact 24b of relay 24 which normally engages contact 24a, a conductor LI5 connecting the contact 24a and a connector 31 on the panel I, a conductor Lit connecting connector 31 on the panel 8 with a connector 31 on the amplifier, a conductor Lil connecting connector 31' and one side of a filament 386! of a thermionically active tube 38, a conductor LI8 connecting theother side of the filament 38a with a connector 39 on the amplifier, a conductor Ll9 connecting the connector 39' on the amplifier with a connector 39 on the panel I, a conductor L29 connecting the connector 39 with a movable contact Me on the relay 24, a stationary contact24f of relay 24 which normally engages contact 24c, a conductor L2I connecting contact 24] and a contact 25a of relay 25, a movable contact 251) of relay 25 which normally engages the contact 25a, a conductor L22 connecting the movable contact 25?] to a connector 40 on the panel, a conductor L23 connecting the connector 40 with a connector 40' on the amplifier, a conductor L24 connecting the connector 40' with one'side of a filament 4Ia of a thermionically active tube M, a conductor L25 connecting the other side of the filament of the tube M with a connector 42' on the amplifier, a conductor L26 connecting'the connector 42 of the amplifier with a connector 42 on the panel I, a conductor L27 connecting the connector 42 with a movable contact 25c of the relay 25, a stationary contact 25 of the relay 25 which engages the contact 25c, a conductor L28 connecting stationary contact 25] with a station- 'ary contact 26a of relay 26, a movable contact 26b of relay 26 which normally engages contact 26a, a conductor L29 connecting the movable contact 26a and a connector 43 on the panel I, a conductor L30 connecting the connector 43 on the panel I with the connector 43 on the amplifier, a conductor L3I connecting the connector 43 and one side of a filament 44a of a thermionically active tube 44, a conductor L32 connecting the other side of the filament 44a with a connector 45 on the amplifier, a conductor L33 connecting the connector 45 with a connector 45 on the panel I, a conductor L34 connecting the connector 45 and a movable contact 262 of the relay 2%, a fixed contact 26f of relay 26 which normally engages movable contact 262, a conductor L35 connecting fixed contact 26f and a negative conments of the several vacuum tubes of the amplifier. Upon the simultaneous operation of the relays 22, 25, 24, 25 and 26, as heretofore described, this series connection of the filaments of the vacuum tubes and the battery 6 is changed so that the filaments of the tubes are connected in parallel across the secondary of a transformer 48 which is supplied by the generator 5, with an alternating current at 110 volts and 60 cycles. This parallel connection to the transformer provides a sufficient voltage and current for raising the temperature of the tubes to operating temperature. However, due to the preheating of the filaments by the supervisory current, the filaments are raised to operating temperature in a period of approximately eight seconds.

Upon the operation of relays 22, 23, 24, 25 and 25, the movable contacts b and d of these relays are disengaged from the contacts a and e and are brought into engagement with contacts and J- The connection of the contacts band at of any one of these relays with the contacts 0 and f connects one of the tubes in parallel with the transformer 48 in the amplifier. Upon the operation of the relay 22, the filament 32a of the tube 321s connected to the transformer. The circuit through which this connection is accomplished includes conductors L3 and L4, connectors 3| and 33' on the amplifier, conductors L2 and L5, connectors 3| and 33 on the panel I, conductors LI and L6, movable contacts 22b and 22d, fixed contacts 220 and 22f of relay 22, conductors Mi and M2 connecting respectively the contacts 220 and 22f of relay 22 with connectors 48a and 481) on the panel 1, conductors M3 and M4 connecting the connectors 48a and 481) on the panel I with connectors 48'a and 48b on the amplifier, and conductors M5 and M6 connecting the connectors 48a and 48'?) to the opposite sides of a coil 47a of the transformer 41. Similar circuits connect the filaments of the tubes 35, 38, 4| and 44 to coils 41b, 41c, 41d, 41!: and 41 respectively of the transformer 41 upon the operation respectively of relays 23, 24, and 26. These circuits include the several conductors M1 to M arranged as the conductors Ml to M5 inclusive of the circuit to the tube 32. Upon the operation of relay I! therefore relays 9, H, l2, I4, 22,23, 24, 25, 26, 28 and 29 are operated and effect the operation of the system to reproduce in the loudspeakers the sound which has been recorded on the phonograph record that is carried by the table driven by the motor I. When this operation is effected, directions and music as heretofore described are emitted from the loudspeakers.

As heretofore stated, the relay 28 is a potential relay and it is deenergized upon a slight reduction in the voltage of the generator. The arrangement of this relay is such that the relay 7 operates to cut the generator off from the amplifier before the filaments of the tubes are cooled by virtue of the deenergization of relays 23, 24, 25 and 26 which connect the filaments of the tube into operative relation with the generator.

tions, the fire producing the abnormal thermal conditions is discovered and extinguished and it becomes desirable to halt the evacuation of the building. For this purpose, there is provided an announcing panel 49 which carries a micro phone 50 and a switch 5| which when closed effects the interconnection of the microphone into the system. The panel board 49 is commonly located in the principals office and in addition to the microphone carries trouble signals that indicate trouble in the system. The microphone is connected into the system through a circuit N which includes a conductor NI which connects a connector 52a. on the panel 1 to the positive line wire A4, a conductor N2 which connects the connector 52a to one side of a choke coil 53, a conductor N3 which connects the other side of the choke coil to a connector 521) on the panel 7 and a conductor N4 which connects the connector 52b to a connector 54a also mounted on the panel I. The conductor N4 is also connected to the negative line wire A2 through a condenser 55. A conductor N5 extends between the panels I and 49 and connects the connector'54a on thepanel 1 to a connector 54a on the panel 49. The connector 54's is connected by a conductor N6 to one side of the microphone, the other side of which is connected through a conductor N'Ito another connector 54'b adjacent'the connector 5471. This latter connector is connected through a conductor N8 to a connector 541) on'the panel 1 and through the connector 541) and a conductor N9 to a connector 55a on the panel I. The connector 55a is connected to a conductor NID which connects the connector to one side of the primary of a microphone transformer 56. The other side of the primary of the microphone transformer is connected through a conductor NH, a connector 5511 and a conductor N l2 to a stationary contact ti on the relay H. The stationary contact I Id of the relay l l cooperates with a movable contact He which engages the fixed contact I Id upon the energization of the relay H but which is normally separated from the contact lid. The movable contact He is connected through a conductor Nl3 to the negative conductor A3. Thus when the relay 5 is energized and the contacts Nd and He are closed there is a complete circuit through the microphone and the microphone transformer 56.

The secondary of the microphone transformer 56 is normally connected to the terminals 13a and 13b which, as heretofore described are connected to the input side of the amplifier 3. This connection includes conductors NM and M5 which connect the secondary of the transformer to connectors. 51a and 511) respectively. The connectors 51a and 51b are connectedthrough conductors Nl5 and NIT to fixed contacts lZa and l2d respectively of the relay l2. The contacts I2a and Hal normally engage the movable contacts I22; and I2c of the relay I2 which, as heretofore described, are connected respectively through the conductors B5 and Bl to the connectors I31) and 13a and thus to the input side of theamplifier 3.

The connection of the microphone into the system is, as heretofore stated, dependent upon the energization of relay; ll. When it is desired to use the system as a public address system, relay Il may be energized throughthe action of the relay 30. The relay 30 includes a contact 3001 which is connected by a conductor OI to the conductor E2. The contact 30d cooperates with a movable contact 300 which is connected by a conductor 02 to the negative conductor A3. The contacts 390 and Sfid are normally separated but are brought together upon the energization of relay 39. Upon the connection of these contacts, a circuit is completed through relays ll and It, the circuit including the negative conductor AS, the conductor 02, contacts 300 and 3M, conductor OI, conductor E2, relay ll, conductor E3, relay l4, conductor E4 and the negative conductor A5. The energization of relay 3!! also effects the operation of relays 22 to 26 inclusive so as to properly connect the vacuum tubes of the amplifier unit into operative relation and the energization of this relay also eifects the operation of relay 28 to cause the operation of the motor generator set and thus provide the current at the necessary voltage for the operation of the amplifier unit. The operation of relays 9 and i2 is, however, prevented upon the operation of the relay 39 and thus the microphone circuit is maintained connected to the input side of the amplifier.

The operation of relays 22 to 26 and the shunting of the relays 9 and i2 so as to prevent their operation is accomplished through contacts 30a and 38b of the relay 39. Contact 3% is C0111 nected through a conductor Pl to the conductor F6 which, as heretofore describechis connected to one side of the relay 9. Thus upon the operation of the relay 39 and the energization of relay' H, as heretofore described, a circuit is completed through the relays 22 to 26 inclusive as follows: negative conductor A3, conductor C5, contact llb of relay ll, contact llc which is engaged by contact Ilb upon the operation of the relay ll, conductor Fl, relays 22 to 26 in series, conductor F6, a conductor Pl, fixed contact 39b of relay 39, movable contact 39a of relay 39, a conductor P2 connecting movable contact 39a and conductor F8, conductor F8, movable contact 28a of relay 28, fixed contact 281) of relay 28 which is engaged by contact 28a upon the energization of relay 28 and positive conductor Flt). In this manner the relays 22 to 26 are operated, the explained operation assuming the operation of relay 28 the operation of which will be explained. The relays 9 and I2 are however shunted out of the circuit through the closing of the contacts 30a and 39b of relay 3!). This shunt circuit includes contact 35b, conductor Pl, conductor FE, relay 9, conductor F'l, relay l2, conductor F8, conductor P2, and movable contact 39a of relay 39. Thus, upon the operation of the relay 29 the relays 9 and I2 remain deenergized.

The operation of the relay 28 is effected upon the movement of contact 30 into engagement with a contact 39c of the relay 39. Upon the energization of the relay 29 contact 39 separates from contact 30g and engages the contact 396. Contact 39a is connected through a conductor Ql to one side of the relay 28. The other side of the relay 28 is, as heretofore described, connected to the positive conductor FIB. The movable contact 39f is connected, as heretofore described, through the conductors GI' and Fl to the fixed contact I la of the relay l l which engages the contact Ho and is thus connected to the negative conductor A3. The circuit through relay 28 which causes the energization thereof therefore includes positive conductor Fill, relay 29, conductor Ql, contacts 39c and 39 of relay 3-9, conductors Gl and Fl, contacts Ho and llb of relay H, and conductors C and A3. The effect of that set to the amplifier.

of the energization of relay 28 is as heretofore described, viz., this relay effects the operation of the motor generator set and the connection Relay 29 is not operated upon the energization of relay 39 and thephonograph portion of the system remains dormant and does not interfere with the operation of the system through the microphone. It will thus be apparent that upon the operation of relay 3!) the system is connected to operate through the microphone as a public address 7 system.

The relay 30 is, as heretofore described, energized upon the closing of the singlepole switch 5i on the announcing panel 49. The circuit R which includes the relay 30 includes the positive conductor Al, a conductor Rl which connects the positive conductor to a supervisory relay 58, a conductor R2 connecting the supervisory relay and the relay 3!], a conductor R3 connecting the relay 3!] and which is connected in common to the stationary contact lla of relay l7 and the stationary contact 59a of a relay 59. Normally, when the relay l! is not operated the contact Ha is in contact with a movable contact l'lb which is connected througha conductor R4 to, a connector 69 on the panel 7. A movable contact 59b of the relay 59, which is normally separated fromthe contact 59a but which engages the contact 5901. upon energization of the relay 59, is also connected to the conductor R4 and thus to the connector Gil. The connector 60 is connected through a conductor R5 to a connector 60 on' the announcing panel and through the connector 69 to one side of the switch Si by a conductor R6. The other side of the switch 5| is connected by a conductor R1 to the negative battery connector Gla on the panel 49. This connector is connected to the negative side of the thirty-two volt battery 6. Across the normally open switch there is 'connected a resistance 62.' This resistance closes the circuit R just described. The resistance is such that the current flowing through the circuit is insufiicient tooperate the relay 39 but it is sufiicient to operate the supervisory relay 58. Upon closing the switch 5|; the resistance 62 which is connected across the, switch will be shunted out of the circuit and upon the happening of that event, sufficient current flows through the circuit to operate the relay 29. The switch 5| is located just below'the microphone and is manually operated. Preferably, it is a switch that when released, automatically opens.

It is to be noted that the circuit to the relay 39 is through fixed and movable contacts Ho and llb of relay l'l. Assuming the inactivity of relay 59, the operation of relay 3!] is dependent upon the continued inoperation of relay ll. The fire circuit which operates the relay l! is therefore. given preference over the switch 5i in the control of the system. This preferential opera tion of relay I! is modified by the relay 59 so that in the event of the operation of relay l'l, its control over the relay 39 is limited to a period of ninety seconds which is sufiicient to complete the automatic operation of the system for directing the evacuation of the building, i. e. one complete cycle of operation of the sound record.

This is accomplished through relay 59 which is a time relay. Upon the operation of relay i! contacts He and H) thereof are brought into engagement. Contact 'I'lf is connected by a conductor Sl to the negative conductor A3. Contact i'lc is connected by a conductor S2 to a heating element 53 associated with the relay 59 and also to one side of the relay 59. The other side of the relay 59 is connected by a conductor S3'in common to a fixed contact 59c of the relay 59 and a fixed contact iiSb associated with the element 63. The element 53 is connected through a conductor St to a fixed contact 59c of the relay 59 which normally engages a movable contact 5901. The movable contact 59d is connected by a conductor S5 to the positive conductor A5. Upon the operation of relay ll there is a circuit through the heat element 033 closed which includes the conductor Si, contacts ilc and ll of relay ll, conductor S2, element 63, conductor St, contacts fiile and 5M, and conductor S5. The element 63 upon heating brings a movable contact 63! which is associated therewith into engagement with contact 53b. The contact 63a is connected through a conductor SE to the positive conductor A5. Thus upon the contacting of contactors 63a. and 631) which are controlled by the heat element 63, a circuit is completed through the relay 59. This circuit includes the conductor Si, contacts 11 and lie of relay ll, conductor S2, relay 59, conductor S3, contacts 630. and 63b and conductor S5 to positive conductor A5. Upon energization of relay as the relay becomes independent of the heat element $3, the circuit through the relay.

being completed through contacts 59a and 5917!. The operation of relay 59 effects the closing of contacts 59a and 59b and through them the completion of the connection to relay 30 which was broken by the separation of contacts Ma and llb upon the energization of relay [1. In this way the control of the system by the relay 3G is rendered ineffective for a period of ninety seconds after the operation of relay I1.

From the above description of the operation of the several parts of the system, the operation of the system as a whole will be apparent. In effect the system forms the combination of a public address system and a signal system for audibly directing the evacuation of a building in the event of the existence of a fire. This automatic direction of the evacuation of the building is accomplished through a sound record on which the directions for evacuation have been previously recorded. In practice, it has been found that for a school system the record preferably contains audible signals as described above.

In the system illustrated all of the parts thereof are under constant electrical supervision. In the event of a failure of any part of the system both an audible and a visual signal are automatically given. Since the panel I may be located in some obscure part of the building and the panel 39 is located in the principals ofiice a general signal is given on the panel 49 upon the impairment of the effectiveness of any part of the system. A specific signal indicating the particular circuit in which the trouble exists occurs upon the panel I.

The fire circuit includes the supervisory relay it. This. relay has two pairs of cooperating fixed and movable contacts wit-49b and !9cl9d. As heretofore explained, this relay is normally energized, being connected into the closed fire circuit D through which sufilcient current flows to energize the relay. Upon a break in this circuit, the relay it becomes deenergized and the normally open cooperating contacts become closed, that is, contact lea engages contact I91) and contact lee engages contact 19d. Contact I 7 59a is connected by a conductor TI to one side of a trouble signal lamp 64 the other side of which is connected to the positive conductor A4. Contact lab is connected to conductor C3 and thus through conductor C 5, contacts Ma and ill) of relay l l and conductor C5 to the negative conductor A3. Upon the closing of the contacts Mia and lfib, therefore, a circuit is completed through the trouble light 64 which indicates trouble. in the fire circuit D. Movable contact ifid of relay i9 is connected to a conductor T2 which is connected to a conductor T3 which connects the conductor T2 and a fixed contact ilf of the relay l I. The fixed contact i if is normally in engagement with movable contact I ie which, as heretofore described, is connected through the conductor Nl3 to the negative conductor A3. Upon the deenergization of relay l9, contact I90 is thus connected to the negative side of the battery. Contact I90 is connected through a conductor T4 to a connector 65. Connector 65 is connected through a conductor T5 to a connector 65' on the panel 49. Connector 6% is connected to a relay W on the panel 9 which is connected through a conductor T! in series with a supervisory relay ill, the supervisory. relay being also connected through a conductor T8 to the positive battery connector bib on the panel 49. It will therefore be apparent that upon the operation of relay l9 and the connecting of the contact i cto the negative side of the battery, a circuit is completed through relays $5 and 8? on the panel 39. Normally, a circuit including relays (iii and S! is completed through a resistance 68 on the panel "i. The resistance 68 is connected at one side to negative conductor A6 and at the other side to conductor T4. Thus there is at all times a closed circuit including relays 66 and iii. The resistance 68 however, is such that the current flowing through the circuit is insufficient to operate relays 86 but sufficient to operate relays Relay 61 acts as a supervisory relay for the connection between the panel 1 and the panel t9 through which trouble signals are transmitted to the panel 49. Upon the operation of the relay l9 and the engagement of the contacts led and l9c, however, resistance 68 is cut out of this circuit and relay 66 is operated.

Upon the operation of relay 68, two pairs of cooperating movable and fixed contacts 66a66b and Etc-66d become engaged. The engagement of thesecontacts effects the operation of a specific trouble signal 69 indicating that trouble exists on the sound control panel, and a general audible trouble signal or bell Hi. The circuit for the operation of the general audible signal includes the conductor Tll' which is connected to the positive connector Gib, a conductor Ul connecting the conductor T8 and one side of the audible trouble signal It, a conductor U2 connecting the audible trouble signal and the fixed contact 66d of relay 6%, movable contact 660 of relay 66, a conductor U3 connecting the movable contact 660 and conductor R1 which is connected to the negative connector fila. trouble signal or light 69 is connected through a conductor V! to the conductor UI, and through a conductor V2 to the fixed contact 66b. Movable contact 66a which cooperates with the contact 66b is connected directly to the conductor U3 and thus to the negative battery connector. Thus, upon operation of relay 65 the trouble signals 69 and- TE) are operated.

If the trouble circuit connected between the two panels is open, relay 61 becomes deenergized.

The specific 6 Upon deenergization, cooperating fixed and movable contacts Ela6'lb and E'icld become engaged and effect the operation of the audible general trouble signal It and a specific visual trouble signal TH which indicates when operated trouble in the interconnection between the microphone panel and the control unit for the sound system which interconnection transmits the trouble signal current. The operation of the trouble signal it is effected through the contacts 630 and 66d which are respectively connected to conductors U2 and U3. Thus upon engagement of these contacts a circuit is completed to the trouble bell it. The trouble signal H, which is a lamp, is lighted upon the engagement of contacts 61a and 67b. The engagement of these contacts completes a circuit which includes conductors T8, Ui, Vi to which the lamp H is connected, a conductor W connecting the lamp H and the contact 671a, contact 61b, conductor U3 to which contact 61b is connected and thus negative connector Sic. With the exception of the signal indicating trouble on the interconnection between the panels which interconnection transmits the trouble signals, the signals on the microphone panel E9 are general in their indication, specific trouble being indicated by trouble lights on the panel i.

The relay 58 is the supervisory relay for the control circuit B. This relay, like the relay i9, is normally energized and includes two sets of normally separated cooperating fixed and movable contacts 58a 58b and 58d-58c. Contacts 58a and 581) control a circuit to a visual trouble signal 12 on the panel 7. The operation of this light 12 indicates trouble on the control circuit R. Its operation is effected through the connection of contacts 58a and 581). Contact 58b is connected to conductor C3 and thus normally to the negative conductor A3. Contact 58a is connected through a conductor X to the lamp l2 which is also connected to the conductor A4. Contact 580 of relay 58 is connected to con-ductor T t in common with contact I90. Contact 5801 is connected in common with contact l9d of relay l9 to conductor T2. Thus, upon closing of contacts 580 and 58d the resistance 68 is cut out of the circuit T.

The loudspeakers are electrically supervised and normally connected into a supervisory circuit including a supervisory relay E3. This supervisory circuit includes relays I! and I4 and is as follows: positive conductor A5, conductor E4, relay [4, conductor E3, relay Ii, conductor E2, a conductor Yi connecting conductor E2 and a stationary contact Me which normally en gages the movable contact i ic, conductor BM, loudspeakers ie, 4b and id, conductor Bl3, contact Md of relay M, a fixed contact M of relay M which normally engages contact l ld, a conductor Y2 connecting contact i4) and relay "i3 and a conductor Y3 connecting relay l3 and the negative conductor A5. The current flowing through this closed circuit is suificient to energize the relay 13 and maintain the contacts thereof normally separated. The relay contains two pairs of fixed and movable contacts 13al3b and Ito-13d. The contacts 13a and 132) are connected into a circuit including a visual trouble lamp M. The trouble lamp is connected to the positive conductor A4 and through a conductor Z to the contact 73a of the relay 73. The movable contact 13b is connected to the conductor C3 and thus to the negative side of the battery. Upon engagement of contacts 13a and 1312, that is,'upon opening the circuit including the loudspeakers and the relay l3, the light 14 is lighted to give a visual signal indicating trouble in the loudspeaker circuit. Contacts 13d and 130 are respectively connected to the conductors T4 and T2 and when engaged shunt the resistance 68 and effect the operation of the circuit T, V

The microphone circuit is also supervised. It

is included in a closed circuit which includes a 1 supervisory relay 75. This circuit includes the conductor N! which is connected to the positive conductor A4, conductor N2, choke coil 53, conductor N3, conductor N 3, conductor N5, conductor NB, microphone i), conductor N7, conductor N8, conductor N9, conductor NH), primary of microphone transformer 56, conductor NI conductor NlZ, relay 1% which is connected to conductor NI2 and negative conductor A6 to which relay I5 is also connected. Thus there is a closed circuit through the choke coil 53, the microphone 50 and the primary of the microphone transformer. 56, relay i5 and the battery 6. Upon the opening of this circuit due to trouble in the microphone the choke coil or the transformer 56, the relay (5 becomes deenergized. Upon deenergization two pairs of fixed and movable cooperating contacts l5a-'i5b and 5c 'i5d' become engaged. The contacts 15a and 15b connect one side of a visual signal It to the conductor C3 and thus to the negative side of the battery. This connection is effected through contact 151) which is connected to conductor C3, contact 75a and a conductor AA which connects contact 75a and the light 16.

.The light 76 is also connected to conductor A4 which is connected to the'light T6. Contacts 150 and 15d shunt the relay 68 out of the circuit T. Contact 15d is connected to conductor T2 and contact 150 is connected to conductor T4. Thus upon engagement, conductors T2 and. T4 are connected together, shunting the resistance 68 out of the circuit T.

The supervisory circuit for the electrical pick-up 2 has been described above. The supervisory relay of this circuit includes contacts 8a. and 8b which upon deenergization of the relay connect one side of the light Ii] to the conductor C3 and thus to the negative side of the battery, the other side of the light ill being directly connected to the conductor A l. Relay 8 also has a pair of fixed and movable contacts 8c-8d which are connected respectively to conductors To and T2 and thus serve upon deenergization of relay 8 ,to shunt relay 68 out of the circuit T and effect the operation of relay 66 on the microphone panel 49.

The motor and generator of the motor generator set and the relay 28 are connected in series for the purpose of supervision. This series circuit includes the positive conductor Hi, the motor 5', the conductor H2, fixed contact 28c of relay 28, movable contact 28b of relay 28, conductor Ii, relay 28', conductor I2, generator 5, conductor I3, movable contact 280, fixed contact 28h normally engaging contact 23c, and a conductor AB connecting contact 28h of relay 58 and one side of a relay 1?, the other side of which is connected to the negative conductor Aiij If for any reason such as an open in the motor or generator, this circuit is opened, two, pairs of cooperating fixed and movable contacts tic-lib and Tic-4M are brought into engagement. The engagement of contacts Tia and 'i'ib eifect the illumination of a trouble light 58, which indicates that there is trouble in the motor generator circuit. One side of the light 18 is connected in common with the other trouble lights to the positive conductor A4.

.common. with several corresponding contacts of the other supervisory relays.

The motor I for rotating the table of the phonol9c-|9d. Contacts 19a and 19b control the op-.

eration of a trouble light 80. The light '80 is connected to the. positive conductor A4 and through aconductor AE to the contact him. Contact/19b is directly connected to conductor C3 and thus normally to the negative side of the battery. Contacts lilo-and 19d are respectively connected to conductors T4 and T2. i

The filaments of the thermionic tubes of the amplifier are also connected into a supervisory circuit. As heretofore described, the filaments of these tubes are normally connected in a series circuit L. ,To the conductor L35 of this series circuit, a conductor AF connects one side of a supervisory relay 8|. The connection to the supervisory relay is through a resistance 82. The relay 8! is also connected to the conductor A6. In this circuit there is a division of current between the conductor AF and-the conductor L35 which is connected through the resistance 45 to the conductor A6. The'divisio n of current-is such that there is sufficient current flowingthrough the serieswonnected tube elements to preheat these elements and a lesser current flowing through the relay 8!. I It is tobe noted. however that the energizationof relay M is dependent upon the continuance of the closed circuit; L. Upon the opening of the circuit L the relay 8i becomes de- 1 energized and closes two pair of normally fixed and ;movable contacts, tla-Blb and Bic-Md, The deenergization of this relay is indicated by a trouble light BS-one side of which is connected to the positive conductor A4 and the other side of which is connected to the contact 8m of relay 8!.-

Cooperating contact 81b is connected in common with the contact Tla of relay TI to the conductor AC2 which, as heretofore described, is connected through contacts 29g and 25h of relay 29 to the negative conductor 13. The completion of this circuit therefore by the engagement'of'contacts Ma and Bib efiects the operationoi the visual signal 83 indicating trouble with the filament circuit L. Contacts 810 and B l d are respectively connected to conductors T4 anl T2 and thus upon energization effect theoperation of the remote signals69 and it on the microphone panel 49.

Relays 9, i2, 22 to 26 inclusive, 28 and 29 are vital for a fire or emergency announcement. Because of this, the windings of these several relays are normally connected in series and are included in a closed supervisory circuit so that the relays are under constant electrical supervision. The

trouble light for this circuit is indicated at Hand the supervisory relay at 85. Thecircuit is as follows: positive conductor Flt, relay 28, conductor G3, relay 29, conductor G2, contacts 30g and 3b of relay 3U, conductor Gi, relay 22, conductor F2,'1'elay '23, conductor F3, relay 24, con- :ductor F t, relay 2%, conductor F5, relay 26, conductor F6, relays, conductor F'i, relay l2, conductor F8, a conductor AF connecting conductor F3 to movable contact 2% and one side of relay 8'5, and negative conductor At which is connected to the other side of relay 85. Upon the opening of this circuit either through injury to any of the relays or the interconnection between the relays, supervisory relay 85 which is normally energized by the current flowing through the circuit becomes deenergized. This relay includes two sets of fixed and movable contacts 85a-85b and 85c 85d. The contact 85a is connected to one side of the light 84 by a' conductor AG. The other side of the light M is connected to the positive conductor A4. Contact 85b is connectedto conductor C3 and thus normally to the negative side of the battery. Upon the engagement of contact 85a and BEbtherefore the light 84 is illuminated indicating trouble in this relay circuit. Contacts 8% and 85dare respectively connectedto the conductors T4 and, T2 so that when'these contacts become engaged upon the deenergization of the relay 85 the resistance 53 is cut out of the circuit T and the remotetrouble signals are operated.

The operation of relay 85 is also effected when the phonograph portion of the system is partially operated. If for any reason this .portion of the system is not set to commence operating and give the directions for evacuating the building upon the operation or" the fire circuit, the relay 85 is deenergized and the signal 84 together with the remote signals are operated. Upon the operation of the table motor I and until the pick-up has completed a cycle and is reset in the position to start the operation of another cycle, a switch 86 is maintained open. This: switch is only closed when the several parts of the phonograph portion of the system are in position to start a cycle of operation. One side of the switch is connected by a conductor AHI to the negative conductor H3.v The other side ofthe switch is connected by a conductor AH: to the conductor Gl. Upon closing the switch, therefore, the relay'85 will be shunted and its deenergization effected. The

shunting of the relay 85 is as follows: the negative conductor H3, conductor AI-Il, switch 86, conductor AHZ, conductor GI. Thus it will be seen that conductor GI will'be connected to the negative side of the battery and both terminals of the relay 85 will be connected to the negative side of the battery and the relay thus shunted.

From the above description it will be apparent that all of the supervisory relays, upon operation,

efiect the operation of the remote signals. 59, and

T0. The signal 69 on the microphone panel indicates trouble with some portion of the sound control system. The trouble signal Iii which may the operation of either the fire control circuit D or the microphone circuit R. If there actually is any trouble in the system occurring during a fire interval, this trouble will be indicated upon the deenergization of relay ll. Signals 18 and 83 are an exception to the dependency of the trouble signals upon the continued inaction of relay i 5. These trouble signals are dependent upon the continued inaction of the relay 29 as they are connected to the negative side of the battery through contacts of this relay.

On the microphone panel 49 there are illustrated visual signals 88 and 81. These visual signals 86 and 81 are for the purpose of indicating trouble in an exit light control system such as that disclosed in the copending application of William D. Lindsey, Serial No. 693,053, filed October 11, 1933, which system may be interconnected for simultaneous operation with the sound system above described. Upon the operation of either one of these signals the trouble signal is also operated. The operation of the trouble signal '10 and the trouble light 81 is eifected by a relay 88 and the operation of the trouble signal 10' and the light 86 is effected by a relay 89. The

relay 89 is in the nature of a supervisory relay and supervises the interconnection between the panel 49 and the panel of the exit light system which interconnection is for the purpose of transmitting trouble signals to the panel 49.

The manner in which this sound control system may be interconnected with the exit light system is illustrated in Fig. 4 of the drawings. In Fig. l the panel 90-23 represents thecontrol panel of an exit light control system such as that disclosed in the aforementioned copending application of William D. Lindsey, Serial No. 693,053. The panel 9l-l indicates a fire alarm control panel such as that illustrated in the copending application of William D. Lindsey, Serial No. 687,278, filed August 29, 1933, and. the panel 9I-2 indicates the remote signal or fire department connection of the system illustratedin this ap plication. In a complete system including the exit light control of the aforementioned application Serial No. 693,053 and the fire connection of application Serial No. 687,278, the several panels are interconnected as illustrated in Fig. 4. The interconnection between the panels 9I-I and 9l-2 are fully described in the copending application Serial No. 687,278. In the interconnection of the panels 90-23 and 9l-l, the contacts 90-39 and 90-39 on the panel 98-23 are connected so that in the event of the operation of the twofire circuits illustrated in the aforementioned application Serial No. 687,278 these connectors are connected to the negative side of the battery, the connectors being individual to two different fire circuits. It will be apparent from application Serial No. 693,053, that the operation of the fire circuit shown therein also connects these connectors 90-39 and 90-39 to the nega tive side of the battery so that the same condition is eifected through the interconnection with panel 9l-l.

A connector 90-5! on the panel 90 is connected to a connector 90'-5| on the announc-v ing panel 49 by a conductor AII extending between the two panels. In the complete circuit, the connector 98-5l on the panel 90-23 is connected into a trouble circuit similar to the trouble circuit T. Upon the operation of a supervisory relay in the exit light control system represented by the panel 90-23, a resistance is cut out of the circuit AI and the connector 90-5l is directly connected to the negative side of the battery. Thus the connector 90'-5l on the announcingpanel 49 is connected to the negative side of the battery. This connector is connected by a conductor AI2 to one side of the relay 88. The other side of the relay 88 is connected by a conductor A13 to one side of the relay 89, the other side of which is connected by a conductor A14 to the conductor T8 and thus to the positive connector 6lb on the panel 49. In this circuit Al, the relay B9 is a supervisory relay and the relay 88 is the operative relay which upon operation effects the operation of the trouble light 81 to indicate trouble in the exit light system or.

controlpanel 90-23. If the circuit AI is broken, the relay 89 becomes deenergized. This relay is normally energized in a manner similar to the relay 6'! of the circuit T.

Upon the happening of the event of trouble in the exit light control panel and the connecting of the connector 90'-5l to the negative side of the battery, the relay 88 is operated. Upon operation the relay 88 closes two sets of normally open cooperating movable and fixed contacts 880-8812 and 880-8811. The contact88b is connected to one side of the trouble light 81 by a conductor AJI. The other side of the light is connectedby a conductor AJ2 to the conductor UI and thus the conductor T8 and the positive connector Bib. The movable contact 88a which cooperates with the contact 88b is connected directly to the conductor U3 and thus to the negative connector 6 la. Upon the closing of the contacts 88a and 88b, therefore, the trouble light 81 is lighted. The contact 88d of relay 88 is connected by a conductor AK to the conductor U2 and the contact 880 is connected to the conductor U3. Consequently, the closing of these two contacts completes a circuit to the trouble bell 10 which circuit includes conductor T4, conductor Ul, trouble bell l0, conductor U2, conductor AK, contacts 88d and 880 of relay 88 and conductor U3. The operation of relay 88, therefore, eiiects the operation of the trouble light 8'! and. the trouble bell 10.

Relay 89 when operated effects the operation of the trouble bell l0 and the trouble light 86 which indicates trouble in the interconnection between the panel 49 and the exit light panel 90-23. The light 86 is lighted through the engagement of contacts 89a and 89b of relay 89. The contact 89b is connected to the conductor U3 and thus to the negative connector 6 la. The contact 89a is connected by a conductor AL to one side of the light 86, the other side of which is connected to the conductor AJZ and thus to the positive connector Bib. It will therefore be apparent that with this interconnection of the several panels any trouble on either the exit light panel 90-23 or the sound control panel 1 or the interconnection between these panels and the panel 49 for the purpose of transmitting trouble signals will immediately effect the oper ation of the trouble bell 10 on the panel 49 and a specific light indicating the location of the trouble.

In Fig. l, a fire circuit D is illustrated which effects the operation of the fire relay H. In the interconnection of the sound system with the exit light system and the fire alarm system represented by the panels 90-23 and 9 I-l, the fire circuit D is not necessary. The fire circuits used in connection with the panel 9l-l are also used to effect the operation of the relay 11. When any fire circuit of the system, which may include several fire circuits, is actuated either manually battery and a pair of contactors 92c and 92d or automatically, the contact l9a on the panel] is connected to the negative side of the battery. In the interconnection of theseveral panels. .this contact I9-a is connected by a conductor AM to a contact 9 Il9a on the panel 9 l--l. Upon the operation of either fire circuit as disclosed in the system of the application Serial No. 687,278, the contact 9l--l9a would be directly connected to the negative side of the battery. This is the effect of the operation of the fire circuit D, that is, cutting out the resistance 20 and connecting the connector 19a to the negative side of the battery. Consequently, the operation of the relay I1 is effected in the interconnection upon the operation of a fire, circuit.

The battery is connected through the several panels to the panel 9I-l where the battery. circuit terminates. The panel 9l-l is. provided with a battery supervisory circuit and thus the battery interconnection between the panels is supervised as. well .as the battery. 1

Where a system of this type is utilized, it is frequently desirable to utilize the battery-6 for the purpose of supplying emergency power for operating some other instrumentalities, for example, electrical time clocks or a radio which might be connected into the sound system and operated through the loudspeakers 4a, 4b and 40,. When it is desired that the battery be so used there is provided an additional pair of panels 92 and 93. .These panels are provided for the purpose of taking care of emergency loads. The panel 93 is provided with connectors 93a, 93b, 93c, 93d, 93e, 931, 93g and 93h. The connector 93a is connected to thecontact 93d through fixed and movable contacts 940 and 94d of a relay 94. The connectors 93b and 930 are connected through fixed and movable contacts 94a and 94b of relay 94. Connector 93a is connected to connector 93d through fixed and movable contacts Me and 94 of relay 94, and connectors 93f and 93g are connected through fixed and movablecontacts 94g and 94h of relay 94. The connectors 93a and 93b receive power from the battery to which they are connected through the panel 92. Power is taken from the panel to supply, for example, program clocks, through the contacts 93c'and 93d. The supply of power is therefore dependent upon the continued inoperation of relay 94. When a radio is used in conjunction with the sound system, it is connected into the system through the connectors 93c and. 93 on the panel 93. The output of the radio is connected to these two connectors and the connectors 93g and 93h are connected into the sound system of Fig. l. Thus upon operation of the relay 94 the connection between the radio and the sound system is broken. Likewise, the connection between the contactors 93a, 93b and93c and 93d is broken upon the operation of relay 94 so that no current is supplied, or can be supplied to the program clocks while this relay is operated. The relay 94 is operated upon the op- 'eration of a fire relay such as the relay 11 so that when the system operates in response to a fire, no current is supplied to the program clocks and the radio is disconnected from the system. All of the current from the battery is thus available ior the operation of the fire signal system.

Panel 92 contains the control elements for two trickle chargers for the thirty-two volt battery. This panel contains a pair of contactors 92a and 92b which are respectively connected to the positivetand negative sides of the thirty-two volt which are respectively connected to the positive and negative side of a six volt battery supplying the system with current at six volts such as the battery 91-4. The connectors 92a and 92b are directly connected to connectors 92c and 921 which are connected to the connectors 6a and 6b on the panel I and the connectors92e and 92d are directly connected to connectors 92g and 92h which are connected to the battery connectors of panel 9l-2. The panel 92 also carries relays 95, 96, 91 and 9B, the trickle chargers 99 and I00 for the thirty-two volt battery, a trickle charger ifil for the six volt battery and connectors 922' and 921' which are connected to the connectors 93a and 93b of the panel 93 through conductors ANi and ANZ. Connectors 92k and 921 on the panel 92 are connected to a source of alternating current such as that usually supplied to a building. These connectors are connected directly to movable. contacts 981) and 98e of the relay 98 by conductors AOI and A02. The primary of the charger llll is connected across the conductors AOI and A02 b-y'conductors API and AP2. The secondary of the trickle charger 99 is connected across the conductors AQI and AQZ which connect the connectors 92c and 92d with the connectors 92g and 9271. respectively. The charger is connected across these conductors by conductors AP3 and AP4. Thus the trickle charger supplies a steady current to the six volt battery.

Normally, the contacts 98b and 98a of relay 98 are in engagement with fixed cooperating con tacts 98a and 98d. These latter contacts are connected respectively through conductors A03 and A04 to the primary of the charger 99. This charger provides a charging current of 1.5 amperes for the thirty-twovolt battery. The secondary of the charger is connected by conductors A05 and A06 respectively tostationary contacts 981 and 98g of relay 98. These fixed contacts 987' and 981 are respectively connected through movable contacts 98h and 9810 of relay 98 to conductors A01 and A08 which are also connected to conductors A09 and A019 which connect the connectors 92a. and 92b to the connectors 92c and 92 Thus normally the primary of the. charger 99 is connected to the source of alternating current and the secondary of the charger is connected to the thirty-two volt battery.

The connectors 92c and 929' of the panel92 through which the emergency power is supplied to the program clocks, are connected across the conductors A09 and A019 in series with the relay.

95. One side of the relay is connected by a conductor ARI to the positive conductor A09 and the other side of the relay 95 is connected by a conductor AR2 to the-connector 927'. The relay 95 has a pair of fixed and movable contacts 95a and 95b which are normally open but which upon operation of the relay 95 areclosed. The contact 95b is connected through a conductor ASI and a resistance I02 to a stationary contact mm of the relay 98. The stationary contact 98% is normally engaged by a movable contact 93112 which is connected by a conductor A82 to the conductor A08 and thus to the negative conductor A0). The fixed contact 95a of the relay 95 is connected through a conductor A83 to one side of the relay 96. The other side of the relay 96 is connected through a conductor A84 to the positive conductor A09. Upon operation of relay 95, therefore, by the increased current due to an emergency supply of power the relay 96 is energized, the circuit being completed through the contacts 95a and 95b of relay 95. The relay 96 has two pair of movable and fixed cooperating contacts 96a-96b and c9lid. The contact SM is connected to the conductor A84. its cooperating contact 950 which is normally disconnected therefrom is connected through a conductor ATI to one side of the relay 9?. The other side of the relay. 9'5 is connected through a conductor AT2 to the negative conductor AOifi. Thus upon energization of the relay 56 the relay 9'! is connected across the positive and negative conductors A09 and A053. This relay 9? is of such a winding and construction that it is not actuated except on a battery which has an output of 2.3 volts per cell. Thus if the voltage per cell is below this rating, the relay 9'? is not operated.

ductor ASS.

The relay 9? has a pair of fixed and movable contacts 9'50; and Qlb which are connected in series with the contacts and 96b of the relay 55. Contact 95a of relay S6 is connected to con Contact 95!) is connected through conductor ASi to contact filb of relay 9?. Contact 97a of relay s1 connected through acone V ductor AUZ to one side of the relay 98. The other side of the relay 88 is connected to the conductor A08 and thus to the negative conductor AOlfl. Upon the operation of the relay 96, therefore, and the continued inoperation of relay 91, relay 98 is operated, the circuit therefor being as follows: negative conductor AOIO, conductor 'AOS, conductor A82, contacts 98m and 9811 of relay 93, resistance H38, conductor ASl, contacts b and 95a of relay 95, conductor A83, contacts 96a and 96b of relay 95, conductor AUI, contacts 971) and 97a of relay 9?, conductor AUZ, relay 98, conductor .AO'l and positive conductor A09. Upon operation, relay 98 moves the movablecontacts 98?) and 98e out of engagement with contacts 98a and 98d and into engagement with contacts 980 and ea Also movable contacts 9871, 987a and 98m are respectivelydisconnected from fixed contacts 932', 981 and 981i, and contacts 98h and 98k are respectively connected to contacts 88a and 987'.

The operation of relay 98 disconnects the battery from the charger 99 and connects it to the charger 100 which supplies a current of six amperes at thirty-two volts. The primary of charger is connected through conductors AV! and AV2 to stationary contacts 980 and 88] of the re lay 98. Thus upon the operation of the relay the primary of the charger is connected across the alternating current circuit. The secondary of the charger Hill is connected through conductors AV3 and AV! to fixed contacts 989 and 987' of relay 98. When the relay operates and contacts 98h and 98k are connected to the contacts 98g and 98 the secondary of the charger is connected to the conductors A07 and A08 and thus to the battery. A current of six am I peres is therefore supplied to the battery when an emergency load is added to the battery. This emergency load is of course cut out in the event of a fire but the added current supplied to the battery serves to maintain the battery in proper condition to take care of a fire signal if one should come through.

When the battery voltage of the thirty-two volt battery 6 is increased to 2.3 volts per cell, the relay 91 will operate. Upon operating the contacts 91a and 91b are disconnected, breaking the circuit to the relay 98 and efiecting the deenergization of the relay. Upon the happening ofsuch an event the conditions are brought back to those originally described. The relay 91 can not come in to the circuit without'the presence of an emergency load but its period of service may extend beyond the period of the emergency load. Such relays as this are well known in the art.

This same system may be used in theatres, hospitals and. asylums. :In hospitals and asylums the loudspeakers are not placed in the rooms of the inmatesbut only where they will be heard by the attendants. In such case, a special musical record represents a confidential signal known to the attendants. Where a confidential signal is desirable, the speakers may be grouped in zones so that only the afiected zone will know of the danger. i

Obviously, features of the systems disclosed in the copending applications of William D. Lindsey, Serial No. 686,913, filed August 26, 1933, and Serial No. 693,056, may be used in conjunction with the complete interconnected system. The

interconnection of the features disclosed in these applications will be readily apparentfrom the above description.

It will be obvious that various changes may be made by those skilled in'the .art in the details of, the signal system disclosed in the drawings and described immediately above as well as in they interconnected system disclosed and described within the principle-and scope of the invention as expressed in the appended claims.

I claim:

1. In a signal'system, a sound reproducing system, a central station for controlling the operation of the sound reproducing system including means for operating the sound system as an address system, additional means for effecting the operation of,-the sound system to give audible directionsincluding a record and means for delivering the recorded sound into the soundreproducing system, and means adapted to be operatedupon the existence of a particular condi tion for effecting the operation of said additional means to effect. the operation of the sound system.

2. In a signal system, a sound reproducing system, a central station for controlling the operation of the soundreproducing system including means for operating the sound system as an address system, additional means for efiect ing the operation of the sound system togive audible directions including a record and means i for delivering the recorded sound into the sound reproducing system, means adapted to be operated upon the existence of a particular condition for efiecting .the operation of said additional means for effecting the operation of the sound system, and meansfor cutting out said first mentioned means for effecting the operation of the sound system upon the operation of said additional means.

3. In a signal system, a sound reproducing system, means for operating the sound reproducing system as a public address system, means for effecting the operation of the sound system mechanically to give audible directions, control means for said mechanical operating means, and 7 operation of the sound reproducing system for means for said record operating means adapted.

to be actuated upon the existence of a particular condition.

5. In a signal-system, an electrical sound reproducing system including a plurality of loud speakers, an amplifier and a central station for controlling the operation of the sound reproducing system including means for effecting the operation of the sound reproducing system for directing a course of procedure including a sound record, an electrical pick-up cooperating with the sound record and connected to the amplifier, means for operating the sound record, and thermostatic control means for said record operating means adapted to effect the operation thereof upon the existence of abnormal thermal conditions.

6. In a signal system, an electrical sound reproducing system including a plurality of loud speakers, an amplifier and a central station for controlling the operation of the sound reproducing system including means for effecting the operation of the sound reproduicing system for directing a course of procedure including a sound record, an electrical pick-up cooperating with the sound record and connected to the amplifier, means for operating the sound record, and thermostatically and manually operated control means each adapted to effect the operation of the sound record.

'7. In a signal system, an electrical sound reproducing system including a plurality of loud speakers, an amplifier and a central station for controlling the operation of the sound reproducing system including means for effecting the operation of the sound reproducing system. for directing a course of procedure including a sound record, an electrical pick-up cooperating with the sound record and connected to the amplifier, means for operating the sound record, control means for said record operating means, means for effecting the operation of the sound reproducing means as a public address system including a microphone and means for operatively connecting the microphone to the amplifier, and means for rendering said microphone connecting means inoperative upon the operation of the sound record operating control means.

8. In a signal system, an electrical sound reproducing system including a plurality of loud speakers, an amplifier and means for effecting the operation of the sound reproducing system, for directing a course of procedure including a sound record, an electrical pick-up cooperating with the sound record and connected to the amplifier, means for operating the sound record, control means for said record operating means, means for effecting the operation of the sound reproducing means as a public address system including a microphone and means for operatively connecting the microphone tothe amplifier, and time controlled means operative for rendering said microphone connecting means inoperative for a definite time interval upon the operation of the sound record operating control means.

9. In a signal system of the type described, a sound reproducing system, a central station for controlling the operation of the sound reproducing system including means for effecting the operation of the system as an address system, additional means for effecting the operation of the sound system to give audible directions including a record and means for delivering the recorded sound into the sound reproducing system, means for effecting the operation of said additional means upon the existence in the building of a particular condition, and means operative conjointly with the operation of said last mentioned means for rendering the system inoperative as an address system.

10. In a signal system of the type described, a sound reproducing system, means for effecting the operation of the system as an address system, additional means for effecting the operation of the system to give audible directions including a record and means for delivering the recorded sound into the sound reproducing system, means for eil'ecting the operation of said additional means upon the existence in the building of a particular condition, and time control means operative upon the operation of said last mentioned means to render the system inoperative as a public address system.

11. In a signal system of the type described, a

sound reproducing system, a central station for controlling the operation of the sound reproducing system including means for effecting the operation of the'system as an address system, additional means for effecting the operation of the system to give audible directions including a record and means for delivering the recorded sound into the sound reproducing system, a series of electrically actuated local signals, a remote signal, and means for effecting the simultaneous operation of said additional means and the local and remote signals upon the existence of a particular condition in the building.

' 12. In asignal system of the type described, a sound reproducing system, means for effecting the operation of the system as an address system, additional means for effecting the operation of the system to give audible directions including a record and means for delivering the record ed sound into the sound reproducing system, a series of electrically actuated local signals, a remote signal, means for effecting the simultaneous operation of said additional means and the local and remote signals upon the existence of a particular condition, and means operative upon the operation of said last'mentioned means for rendering the sound reproducing system inoperative as an address system.

13. In a signal system of the type described, a sound reproducing system, a central station for controlling the operation of the sound reproducing system including means for eifecting the operationof the system as an address system, additional means for effecting the operation of the system to give audible directions including a record and means for delivering the recorded sound into the sound reproducing system, means for effecting the operation of said additional means including a thermostat, and means operative upon the operation of said last mentioned means to render the system inoperative as an address system.

WILLIAM D. LINDSEY. 

